Inline images may display as a Red X in Outlook

In Microsoft Outlook, inline images within an e-mail message may display as a Red X rather than the intended image. Cause. The cause varies depending on the Outlook version. Microsoft Outlook 2016 and 2013: The behavior occurs if the image is not embedded in the message, and the following registry value is NOT set, or is absent:

https://support.microsoft.com/en-us/topic/inline-images-may-display-as-a-red-x-in-outlook-704ae8b5-b9b6-d784-2bdf-ffd96050dfd6